From what I've been able to find...
While it can be a food safe sealant, it does not do well when in constant contact with water. So I don't know if that will pose an issue with the humidity in the enclosure.
I saw that a few people had used it for Tarantulas and beardies ...but the fish enthusiasts hate it, even for something simple like sealing a bulkhead in a bucket.
It still needs to offgas and cure just as a silicone does. I just don't know if the misting and water contact will be an issue. If it says that it is 'food grade' on the tube, that's also better than just a basic caulk as well. That doesn't mean it's entirely non-toxic to reptiles but better than the other types for sure.
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